diff --git a/scripts/bom-gen.ts b/scripts/bom-gen.ts
index 5b954fe..68d1908 100644
--- a/scripts/bom-gen.ts
+++ b/scripts/bom-gen.ts
@@ -1,22 +1,11 @@
-#!/usr/bin/env node
+#!/usr/bin/env tsx
 // BOM generator — walks asset directories, lists files, prompts for descriptions, outputs BOM.yaml
-//
-// Usage:
-//   npx tsx scripts/bom-gen.ts [asset-root]
-//
-// Expected directory structure:
-//   audio/          — audio files
-//   images/         — image files
-//   fonts/          — font files
-//   videos/         — material video clips
-//
-// Output: BOM.yaml (YAML frontmatter-style)
 
 import { readdirSync, statSync, writeFileSync } from "node:fs";
-import { resolve, relative, join } from "node:path";
+import { resolve, relative } from "node:path";
 import { createInterface } from "node:readline";
 
-type Asset = { path: string; size: number; description: string };
+type Asset = { path: string; size: number; description: string; hash: string };
 
 const ASSET_DIRS = ["audio", "images", "fonts", "videos"];
 
@@ -27,10 +16,16 @@ function walk(dir: string): Asset[] {
     if (entry.isDirectory()) {
       assets.push(...walk(full));
     } else {
+      const s = statSync(full);
+      const content = readFileSync(full);
+      // Simple hash: first 16 chars of node hash
+      const { createHash } = await import("node:crypto");
+      const hash = createHash("md5").update(content).digest("hex").slice(0, 8);
       assets.push({
         path: relative(".", full),
-        size: statSync(full).size,
+        size: s.size,
         description: "",
+        hash,
       });
     }
   }
@@ -84,11 +79,13 @@ async function main() {
     )).trim();
   }
 
-  // Build YAML manually (no dependency)
+  // Build YAML
   let yaml = "---\nbom:\n";
   for (const a of all) {
-    const desc = a.description.replace(/"/g, '\\"');
-    yaml += `  ${a.path}:\n    description: "${desc}"\n`;
+    yaml += `  - file: ${a.path}\n`;
+    yaml += `    size: ${a.size}\n`;
+    yaml += `    hash: ${a.hash}\n`;
+    yaml += `    description: "${a.description.replace(/"/g, '\\"')}"\n`;
   }
   yaml += `total_files: ${all.length}\ntotal_size: ${totalSize}\n...`;